using Akka.Actor;
using ZB.MOM.WW.ScadaBridge.ManagementService;

namespace ZB.MOM.WW.ScadaBridge.ManagementService.Tests;

/// <summary>
/// Tests for the <see cref="ManagementActor"/> supervision strategy. The project convention is that long-lived
/// coordinator-style actors declare an explicit Resume-based strategy.
/// </summary>
public class ManagementActorSupervisionTests
{
    /// <summary>Verifies that the supervisor strategy is a one-for-one strategy.</summary>
    [Fact]
    public void CreateSupervisorStrategy_ReturnsOneForOneStrategy()
    {
        var strategy = ManagementActor.CreateSupervisorStrategy();

        Assert.IsType<OneForOneStrategy>(strategy);
    }

    /// <summary>Verifies that the supervisor strategy resumes on an arbitrary exception.</summary>
    [Fact]
    public void CreateSupervisorStrategy_ResumesOnArbitraryException()
    {
        var strategy = (OneForOneStrategy)ManagementActor.CreateSupervisorStrategy();

        var directive = strategy.Decider.Decide(new InvalidOperationException("boom"));

        Assert.Equal(Directive.Resume, directive);
    }

    /// <summary>Verifies that the supervisor strategy resumes indefinitely.</summary>
    [Fact]
    public void CreateSupervisorStrategy_ResumesIndefinitely()
    {
        var strategy = (OneForOneStrategy)ManagementActor.CreateSupervisorStrategy();

        // Coordinator actors should not give up: unbounded retries.
        Assert.Equal(-1, strategy.MaxNumberOfRetries);
    }
}